Otterbox case keeping screen off after call

So I bought a $40 generic otterbox case for my straight talk GS2. And now whenever I make a phone call the screen turns off and WILL not turn on, even when pressing the buttons on the phone, until I take the case completly off. I'm thinkin maybe its the sensors? But idk any ideas? because I don't want to have this phone in my pocket and what not without a good case.

So I bought a $40 generic otterbox case for my straight talk GS2. And now whenever I make a phone call the screen turns off and WILL not turn on, even when pressing the buttons on the phone, until I take the case completly off. I'm thinkin maybe its the sensors? But idk any ideas? because I don't want to have this phone in my pocket and what not without a good case.

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Yes, the sensor might be triggered due to the fitment of the case. You can try another case or possibly modify the case you have near the sensors.